JPS63229030A - Hemomanometer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a sphygmomanometer that measures blood pressure using a non-invasive measurement method such as the oscillometric link method.

[Prior art]

The importance of blood pressure control as an item of health management has been recognized, and blood pressure monitors that can be measured by individuals without relying on a doctor are becoming more widespread. The invasive method of measuring blood pressure, in which a catheter is inserted into a blood vessel and the pressure is directly measured, is the method that yields the closest value to the true blood pressure, but catheter insertion can only be done safely by an experienced person. This is a method that can be carried out in many cases, and is not suitable as a method for individuals to easily measure blood pressure. Therefore, sphygmomanometers that use a simple non-invasive measurement method that indirectly measures blood pressure using events closely related to blood pressure have become popular.

As a non-invasive measurement method, a cuff is wrapped around the upper arm of the person to be measured, air is blown through the cuff to compress the upper arm, and once the pressure has risen to a predetermined level, the pressure is reduced and the peripheral artery is measured using a stethoscope. Detect the Korotkoff sound, and define the pressurization value at the detection start point of the Korotkoff sound as the systolic blood pressure and the detection end point as the diastolic blood pressure R i v
a-Rocc i method, the ultrasonic Doppler method in which an ultrasound transmitter/receiver is installed in the artery under the cuff and detects the movement of the artery wall as a Doppler signal due to the sudden opening of the artery, and the intracuff pressure and amplitude of arterial vibration. There is an oscillometric method that measures blood pressure based on the correlation between blood pressure and blood pressure.

Incidentally, blood pressure fluctuates even within a day, and the measured value differs between at rest and when under stress. Therefore, blood pressure values measured only once at any given time under special conditions such as at rest can accurately assess the state of health; It can be said that the credibility of drug efficacy evaluation is low. Therefore, there is an increasing need to understand the oral rhythm of blood pressure and to measure it under stress, and a blood pressure monitor that can measure blood pressure unrestrictedly for a long period of time has been devised. Data recording methods for such blood pressure monitors include a telemeter method in which measured data is collected and recorded via an antenna or the like, and a method in which data is directly recorded in a portable data recording device. (“Japan Clinical” Vol. 39, No. 7, 1981
).

[Problem that the invention seeks to solve]

By the way, with the conventional telemetry method, measurements can only be made within the range where the antenna for collecting data is installed, which limits the movement range of the person being measured. Since the device only records data and does not have a display means, it cannot monitor the measured data moment by moment, and requires a special playback device to play back the recorded data.

The present invention has been made to solve these problems, and an object of the present invention is to provide a blood pressure monitor equipped with a portable data recording device capable of displaying measured data.

Means for Solving Problem c] The present invention provides a portable blood pressure needle that measures blood pressure using a non-invasive measurement method and stores the measured value in a memory, and a timer that sets the measurement time interval. The device is characterized by comprising: a means for measuring blood pressure at intervals set by the timer; and a display for displaying the value stored in the memory.

[Effect]

The device of the present invention uses a non-invasive measurement method to repeatedly measure blood pressure at predetermined intervals arbitrarily set by a timer, while storing the measured values in a memory and displaying the stored values on a display.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on drawings showing embodiments thereof. Among the non-invasive measurement methods described above, the oscillometric link method, which is resistant to noise such as body movement, is employed in the device of the present invention.

The features of the oscillometric method are that it is resistant to noise, and can be measured even in conditions where Korotkoff sounds are difficult to hear, such as during hypotension (9) shock, and (2) in principle, blood pressure and pulse waves are present at the measurement site. For example, it can be measured at the wrist, ankle, etc. (as in the case of using the 31R4va-Rocci method). These include avoiding and gaining the influence of such things.

First, the principle of measurement using the oscillometric method will be explained.

When measuring blood pressure non-invasively, regular oscillations (oscillations) occur with the arterial pulse as the cuff pressure decreases from the point above the systolic pressure of the heart to the point below the diastolic pressure. ) phenomenon occurs in the cuff internal pressure.

When the cuff pressure is gradually reduced, the amplitude of the oscillation is very small at first, and gradually increases.
The amplitude increases rapidly at a certain point, then gradually increases, reaches its maximum, and then gradually decreases again. At a certain point, the amplitude suddenly decreases, and then gradually disappears. Figure 1 shows
This is a graph showing the relationship between such oscillation phenomenon and cuff pressure, and in the oscillation method, blood pressure is measured based on the correlation between the two. In other words, the point where the vibration amplitude rapidly increases corresponds to the systolic pressure, the so-called systolic pressure; the point where the vibration amplitude rapidly decreases corresponds to the diastolic pressure, the so-called diastolic pressure; and the point showing the maximum amplitude corresponds to the mean blood pressure. J vol, 53
No. 11.1983).

Next, the configuration of the device of the present invention will be explained based on a schematic diagram of the blood pressure monitor main body shown in FIG. The operation surface of the thin, box-shaped blood pressure monitor body displays numerical settings and various commands (data display).
MO) ・Data printing (PO) ・Time setting (SET
) ・Interval time setting (TMR) ・Memory clear (MC) ・Reset (RT)
It is equipped with a don't-to-mato matrix display 2 made of liquid crystal or the like that displays required data in characters according to time setting/interval time setting commands.

Furthermore, an increment/decrement switch 3 for instructing forwarding or reversing of display data, an automatic/manual selection switch 4 for blood pressure measurement, an initial pressure setting switch 5 for cuff pressurization, a measurement start/stop switch 6, a power switch 7, etc. is provided. Further, a pressure sensor is attached to the cuff (not shown), and the detected value of the pressure sensor is input to the data recording device. The main body of the blood pressure monitor is provided with an output terminal 8 for a printer, making it possible to print data on a printer.

In addition, the data recorded in the data recording device can be read out using an IC card or the like, and by inputting the data into a playback device equipped with a separately provided graphic display, the data can be used to record intraoral blood pressure rhythms or oscillations during one measurement. It is possible to graphically display the relationship between cuff ration and cuff pressure on the display. The sphygmomanometer itself is carried in an abdominal belt or the like, as shown in FIG. 5, which shows an example of how it is worn.

\I, Figure 3 shows a processing circuit for signals to be input to the information processing section within the body of the blood pressure monitor. In the figure, reference numeral 1 denotes a pressure sensor provided in the cuff, and the pressure sensor 1 detects the internal pressure of the cuff caused by air supply to the cuff, and converts this into an electrical signal. The converted electrical signal is amplified by a differential amplifier 2 and an amplifier 3, the amplified signal is output from the amplifier 3 with a voltage proportional to the pressure, the output signal is converted into a pulse signal by an integrator 4 and a comparator 5, and this The pulse signal is sent to an information processing unit 13 consisting of a CPU, and is converted into a pressure value. In addition, vibrations that appear intermittently in the cuff internal pressure along with arterial pulsation are detected by the pressure sensor 1 and converted into electrical signals, which are amplified by the differential amplifier 2 and amplifier 3, and the DC component is converted by the capacitor 3'. The signal is canted and amplified by an amplifier 6. The amplified vibration signal is amplified by the buffer amplifier 7, and the amplified signal is
The sample and hold circuit 8 is manually inputted.

Further, the vibration signal amplified by the amplifier 6 is amplified by the buffer amplifier 10 and output to the comparator 12 via the comparator 11, and the output signal of the buffer amplifier 10 is differentiated and input to the comparator 12.

The comparator 12 outputs a strobe signal synchronized at the peak of vibration based on the input comparator signal and differential signal, and the strobe signal is input to the sample and hold circuit 8, which detects the peak value of vibration. Hold and set the held peak value to A/
Output to D (analog/digital) converter 9.

The A/D converter 9 A/D converts the peak value of the input pulse wave vibration. This peak value is output to the information processing section 13 in synchronization with the strobe signal output from the comparator 12. Furthermore, the information processing unit 13 is provided with a timer 14 that performs a timekeeping operation according to timer settings, and is further provided with a compressor motor that automatically pressurizes and depressurizes the cuff.

As described above, the peak values of vibrations that appear intermittently with arterial pulsation and the corresponding internal pressure of the cuff are sequentially processed until the vibrations are no longer detected or the pressure falls below a specified value that can identify the diastolic blood pressure. 13. The information processing unit 13 uses a program based on, for example, the method shown in Japanese Patent Application No. 1983 to calculate the optimum value based on the correlation between the amplitude of vibration, such as the amplitude increase rate and amplitude decrease rate, and the cuff internal pressure. Determine hypertension/diastolic blood pressure. Furthermore, the average value of the time between strobe signals, that is, the time between arterial beats, is determined, and the pulse rate is calculated based on this time.

In addition, the initial pressurization value that is measured as the pressure decreases is generally considered to be optimal at a value that exceeds the systolic blood pressure by 20 to 30 mm 11 g.
It is configured to set a value exceeding 0 to 30 mmHg as the initial value, but if the set value does not sufficiently exceed the systolic blood pressure as a result of actual measurement, the measured systolic blood pressure may be set by 20 to 30 mmHg.
After automatically repressurizing to the optimal pressurization value exceeding ml (g), perform the measurement from the beginning again while depressurizing.

Next, the data stored in the memory 15 in the information processing section will be explained. The memory 15 stores data for up to 50 measurements, each consisting of systolic blood pressure, diastolic blood pressure, pulse rate, measurement date and time (8:00 a.m. on the first day of the month), and is numbered in the order of measurement. A single pulse wave trend (time axis value) formed by gathering up to 80 points of data with each vibration peak value of the pulse wave and the corresponding pressure value as one point is a maximum of 10 points.
The display 2 is stored based on these data.
Displays numerical data and graphs based on the data.

Note that a backup power source is also used as the power source so that the data in the memory 15 is retained even if the main power source is turned off.

The device of the present invention configured as described above has a timer function,
Blood pressure measurement can be performed automatically at set time intervals. In this embodiment, an arbitrary interval time of 5 to 60 minutes can be set using matrix key 1. Note that an external power supply timer is used to set an interval time of 60 minutes or more. It also has a clock function for measuring data.
May 1st.

Read out the data for hour 1 minute 1 second and store it in the memo January 5 along with the measurement data. Note that the time can be corrected by operating the time setting instruction key and the numerical keys of the matrix key 1.

Furthermore, when measuring with a timer, a start sound is output at the start of each measurement.

In addition, the LCD dot matrix display 2 displays the year, month, date, hour, minute, and second, as well as the current measurement data such as data number, systolic blood pressure, diastolic blood pressure, pulse rate, and measurement time, as well as the interval time and timer switch. 0N10FF is displayed, and measurement data of an arbitrary number is displayed according to a data display instruction.

In addition, in the device of the present invention, a power-saving type C-
It is miniaturized by using MOS IG as a battery power source, and is also equipped with a data display function, which displays the data stored in the memory as numerical values, as well as graphs such as oral blood pressure rhythm created based on the data. Note that if the display function is limited to either numerical data display or graph display, the blood pressure monitor can be made more compact.

Next, the procedure for blood pressure measurement will be explained based on the flowchart shown in FIG. The functions of the device of the present invention can be roughly divided into:
Examples include automatic measurement using interval time settings, single-shot manual measurement, and data display. Figure 4 (a)
(b) is a routine showing the operation procedure other than these function selection and measurement, and (b) is the routine showing the measurement procedure. First, automatic measurement using interval time settings involves wrapping a cuff etc. around the arm and setting the optimum pressurization value and interval time that exceeds the subject's empirically obtained systolic blood pressure by 20 to 30 mmHg. When the start switch is pressed, the start flag turns on and the compressor motor is driven to start supplying air to the cuff.
The measurement routine shown in FIG. 4(b) is executed. That is, read the set optimal pressure value (1), start pressurizing the cuff by supplying air 2), pressurize to the read optimal pressure value (3), and start decompression 4). , the systolic blood pressure is detected from the pulse wave detected along with the arterial pulsation based on the principle of the oscillation method (5). If the difference between the detected systolic blood pressure and the set optimal pressurization value is 20 to 3 cm11 g or more,
After determining that pressurization suitable for measurement has been performed (6), the diastolic blood pressure is detected while reducing the pressure until it becomes impossible to detect a pulse wave or to a specified value that is below the diastolic blood pressure by a predetermined amount.

Also, the difference between the detected systolic blood pressure and the set value is 20 to 30 m.
If the pressurization value is below mHg and is unsuitable for measurement (7), pressurization is performed again until it reaches an appropriate value (8), and the blood pressure measurement accompanying the depressurization is performed again from the beginning. When the measurement is completed, the systolic blood pressure, diastolic blood pressure, and pulse rate are determined at 00, and rapid exhaustion (9) is performed.

When one measurement is completed, the same measurement as described above is repeated at set interval times, and the measurement data of each measurement is stored in the memo January 5. At the start of each measurement, a start sound is output, and 20 seconds later, the measurement begins with pressurization. In addition, as shown in Figure 4 (a), in the case of one-off measurement (11), there is no need to set the timer, the start flag is not turned on, and the measurement routine in Figure 4 (b) is performed. is executed as before.

Furthermore, as shown in FIG. 4(a), the data stored in the memory is displayed on the display in response to a data display command given from matrix key 1 (12), and the displayed data can be forwarded or reversed. , specified by the increment/decrement switch 3.

In addition, the stored data is output to an IC card, etc., and this data is input to a separately provided playback device, and the graphic display shows changes in blood pressure in the mouth, the relationship between pulse waves and blood pressure in one measurement, etc. may be displayed as a graph and used for symptom determination, drug efficacy evaluation, etc.

〔effect〕

The device of the present invention uses a power-saving C-MOS IC in the main body of the blood pressure monitor, which performs unrestricted measurements over a long period of time, to enable operation using battery power, making it portable and miniaturized. In addition, the data is visualized in a graph display to make it easier to understand the circadian blood pressure rhythm, and it also has a timer function that allows you to set the time arbitrarily, and automatically measures at set intervals, making it easier to operate the blood pressure monitor. 1
It has the excellent effect of promoting the implementation of daily blood pressure measurement and counteracting more accurate symptom diagnosis and drug efficacy evaluation based on oral blood pressure rhythm.

[Brief explanation of drawings]

Fig. 1 is a graph showing the principle of the oscillometric measurement method used in the present invention, Fig. 2 is a schematic plan view of the main body of the inventive device, Fig. 3 is a circuit diagram of its main parts, and Fig. 4 is the measurement procedure. Flowchart 1 and FIG. 5 are diagrams showing an example of mounting. 1... Matrix key 2... Display 13
...Information processing unit 14...Timer 15...Memory patent Applicant Sanyo Electric Co., Ltd. Agent Patent attorney Noboru Kono Answer 1 Zubo 2 Old

Claims (1)

[Scope of Claims] 1. A portable blood pressure monitor that measures blood pressure using a non-invasive measurement method and stores the measured value in a memory, comprising: a timer for setting measurement time intervals; and settings for the timer. A blood pressure monitor comprising a means for measuring blood pressure at intervals of time and a display for displaying the values stored in a memory.